Event: Grand Prix S3

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Opponent	Rating	Result
David A Hallen	1486	0 - 1
Rowan J Webb	1375	1 - 0
Colin Abell	1509	0 - 1
S Ali Arshad	1167	½ - ½

performance = (sum(opponents ratings) + 400(wins-losses)) / games

1284 = (5537 + 400 * (1 - 2)) / 4)